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The alterations in migration, proliferation, and mechanics of cells observed during cancer progression can potentially be linked to enhanced tumor invasiveness. These properties are frequently attributed to the ability to form distant metastasis; however, the direct mutual connection between these properties is not always proven. Here, we studied t...
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... However, the wavelength k ) 2pa (long wavelength approximation). Moreover, the wave velocity (c) is considered as the velocity scale, which is of the order of 1 cm/s [35,36]. Using the above dimensionless variables and utilizing the stream function W(r, z) as (23) where the stress tensor components are adopted from Hayat et al. [37]. ...
The present study investigates electroosmotically modulated peristaltic transport of third-grade fluid through a microtube taking into consideration the intricate coupling of zeta potential and hydrodynamic slippage. The analytical results encompass the mathematical expressions for dimensionless electrical potential distribution as well as series solutions for stream function and axial pressure gradient up to first order utilizing the perturbation technique for small Deborah number coupled with the Cauchy product for infinite series. Critical values and ranges of wavelength have been obtained where the axial pressure gradient vanishes. Moreover, pivotal values and ranges of wavelength have also been noted for the invariance of pressure gradient with respect to Deborah number as well as Debye-Hückel parameter. Trapping phenomenon has also been investigated by contours of streamlines wherein the zones of recirculation or trapped boluses are formed predominantly near the microtube walls. Additionally, the relative enhancement in hydrodynamic slippage amplifies the trapped bolus size, whereas, a diminishing behavior on bolus size is observed by the electroosmotic parameter.
Peristalsis is a common motion in various biological systems, especially the upper urinary tract, where it plays a pivotal role in conveying urine from the kidneys to the bladder. Using computational fluid dynamics, this study aims to investigate the effect of various peristaltic parameters on the motion of an obstacle through a two‐dimensional ureter. Methodologically, Incompressible Navier–Stokes equations were utilized as the fluid domain's governing equations, and the Dynamic Mesh method (DM) was employed to simulate the peristaltic and obstacle motion. The peristaltic motion was modeled by a sinusoidal contraction wave propagating alongside the ureter at the physiological speed, and the motion of the obstruction through the ureter, which is caused by the fluid forces applied on its surface, was explored using the equation of Newton's second law. Various test cases of different shapes and sizes were supposed as kidney stones to understand the influence of the peristalsis properties on the stone removal process. The results show that the motion of the kidney stone is highly influenced by the gradient pressure force applied to its surface in the fluid domain. Moreover, investigating the effects of the peristaltic physical properties on the obstacle's motion indicates that the stone's motion is dependent on these parameters. Furthermore, this analysis provides insight into the peristaltic motion effects, assisting physicians in developing new medicines to facilitate the kidney stone removal process based on its shape and size.
Recently, great efforts have been made to develop materials based on magnetic metal oxides to realize excellent electromagnetic wave absorption properties. Nevertheless, the use of traditional magnetic metal oxide materials with certain magnetic losses is not only difficult to meet the final requirements, but also limits the thickness of the absorber and their range of use. Therefore, some promising magnetic metal oxide composites with excellent conductive and magnetic losses have been fabricated, which have specific structures having and interfacial polarization and multiple reflections. Here, the theory of electromagnetic microwave absorption is discussed. Afterwards, the accomplishments in the fabrication of magnetic metal oxides and their composites are reviewed. Furthermore, electromagnetic wave absorption performances and relevant influencing factors of magnetic metal oxides and their composites are exhibited in detail. At last, current challenges are exhibited and future prospects of this developing field are discussed.
